New Roof Leaking
Ok, So I have a customer purchased a roof through home depot. The Shingles are GAF and appear to be installed properly.
I hope I can paint a mental picture cause I didn’t take any but the installation layers go like this
When you look at the edge of the roof you 2″ white steel drip edge, a dark fibrous looking 1/2″ under layment and then the shingles. When I asked the home owner what that was for she said it was for ventilation.
Is anybody familiar with this type of “roofing system” If so where would I get more info. I’ve been to the GAF site and didn’t find any ventilation board in 4×8 sheets.
It is over a moblie home built for a shingled roof system.
As I mentioned the roof leaks and it is my belief that the vent board should be under the drip edge, if that is, in fact what it is.
I'd need a scetch or photo to understand that one
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I figured but I thought I'd try. I finished my project for her last week and can't get back for a bit. According to hte customer it is a roofing system but I have never seen anything like it.
Think about seeing 1/2" plywood above the drip edge but below the shingles. Except the plywood is black and looks a bit like fabric.
Could the ventilation material be 'Cedar Breather'? It's a fiberous plastic mat that supposed to go under cedar roofing shingle and shakes.Where is the leak? If the shingleas are installed properly, I don't see how this extra layer, by itself, would cause leaks.Al Mollitor, Sharon MAhttp://moosehilljournal.blogspot.com/
It could be that. If this extra layer isn't sealed to the drip edge somehow it seems to me that wind and rain could combine to make some leaks around the perimeter. Which is where the leaks have appeared. She said she noticed the leaks around her windows and the cieling is staining around the perimeter.
Would HD be using a product like Cedar Breather? I'm guessing it's homasote, but let's wait and see if any photos are forthcoming.
Same thought, but lacks evidence.
Cb over De is OK, but w/shingles? no way. Ya can't.
I guess ya could nail over Homasote. But not in my world.
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I could try to bounce past there tommorrow.
Maybe I'll call the homeowner and see if she can post some photos
Edited 8/3/2006 10:31 pm ET by TMO
Edited 8/3/2006 10:33 pm ET by TMO
I don't know what homasote is; must be a regional term we don't use here.
Could it be 'Black Joe'? This is ½"-thick tarred pressed-cardboard often used as sheathing on cheaper houses. I have seen it used on roofs as an exterior 'insulation' layer (it gives about R-2) but there's no way it should be over the drip edge. It's tarred, but the edge will soak up water like a sponge after a freeze-thaw cycle.
By itself, it shouldn't cause leaking if the shingles are properly laid over it and the flashings are properly one. But if somebody put the drip edge below it, I'd suspect some other mistakes are likely to have been made, too....
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